Hydraulic torque impulse generator
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United States of America Patent
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-
Dec 6, 1988
Issued Date -
N/A
app pub date -
Apr 13, 1988
filing date -
Jan 23, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hydraulic torque impulse generator comprises a motor rotated drive member (16) including a fluid chamber (18) into which the rear end portion (19) of an output spindle (21) extends to receive torque impulses generated in said fluid chamber (18). The rear end portion (19) of the output spindle (21) carries a radially sliding vane (23) for cooperation with the fluid chamber (18) such that a high pressure compartment and a low pressure compartment are accomplished during a limited portion of the relative rotation between the drive member (16) and the output spindle (21). A seal barrier (43-50) around the output spindle (21) prevents fluid leakage from the fluid chamber (18). The seal barrier comprises a clearance seal (43) between the fluid chamber end wall (38) and a low pressure area which is sealed off to the atmosphere by low pressure seal rings (47, 48, 60). A piston (46, 64) is arranged to compensate for temperature related volume changes in the hydraulic fluid, and to ensure a substantially constant nominal pressure within the fluid chamber (18).
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